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스크린 마크 공격 : 새로운 정지영상 워터마킹 공격 기법
박현중,이충훈,이흥규 한국방송공학회 2001 방송공학회논문지 Vol.6 No.1
This paper describes a new watermarking attack algorithm, a screen mark attack. The screen mark attack is a modified overmarking attack, which attacks a watermarking system by inserting another watermark into a marked image. Overmarking attack has a problem that it cannot be applied to a public watermarking software that prohibits the watermark embedder from embedding another watermark into an already marked image. However, the proposed attack algorithm can be applied to such a public watermarking scheme. Test results show that the proposed watermarking attack algorithm is successful for commercial watermarking softwares and attacked images show better quality than images attacked by other attack tools.
Acute Vestibular Syndrome Preceded by Otologic Symptoms in Sarcoidosis
박현중,김재명,최한솔,이태범,이승한 대한평형의학회 2021 Research in Vestibular Science Vol.20 No.2
Sarcoidosis is a rare, multisystem granulomatous disease. Neurological compli-cations occur in about 5% of patients and vestibulocochlear involvement is even rarer. A 27-year-old woman presented with acute spontaneous vertigo for 5 days. She was diagnosed with pulmonary sarcoidosis 4 months ago, but specific treat-ments have not yet started. She had preceding otologic symptoms including bilateral tinnitus and ear fullness in the right for 3 months without hearing loss. Initial bedside examinations revealed spontaneous right-beating nystagmus and abnormal catch-up saccades in the left during head impulse tests (HIT). After 2 weeks, video-oculography documented the direction of spontaneous nystagmus was changed into left-beating. Caloric test showed canal paresis in the left, and video HIT showed subtle covert saccades. After starting oral prednisolone, her symptoms improved rapidly. In our case, acute vestibular syndrome and otologic symptoms might be associated with sarcoidosis when considering clinical course and treatment response. Sarcoidosis may be considered as a cause in cases with audiovestibulopathy of unknown etiology.
강유리,최한솔,박현중,김신아,강경호,박제우,박만석,조기현 대한신경과학회 2021 대한신경과학회지 Vol.39 No.1
Although isolated contralateral tongue deviation following unilateral cortical infarction was occasionally reported, the unilateral lesion usually produces no significant deficit of tongue motility considering bilateral supranuclear innervation of the hypoglossal nerve. We observed a patient with obvious tongue paralysis, including intrinsic muscles, caused by ischemic stroke involving the motor area of the tongue in the primary motor cortex.
제대 염전과 일측 태아의 자궁내 사망을 동반한 일 양막성 쌍태 임신 1 예
김정욱,김형용,박현중,신용각,정찬우,박채웅 대한산부인과학회 1999 Obstetrics & Gynecology Science Vol.42 No.6
저자들은 1998년 1월 23일 본원 산부인과에 내 원 한 23세 초산부에서 제대 염전과 일측 태아 사망을 동반한 일양막성 쌍태 임신 1예를 경험하였기에 문헌 고찰과 함께 보고하는 바이다. Monoamniotic twin pregnancies are relatively rare, occurring in 1 to 3 percentage. They are of particular concern to the obstetrician because the associated perinatal mortality is high.B Major cause of fetal death are umbilical cord entanglement, congenital abnormalities, and twin-twin transfusion syndrom, preterm delivery. A case of single fetal death in a monoamniotic twin with the entanglement of umbilical cord is reported with a brief review of the literatures.
김정욱,김호성,김형용,박현중,강유미,신용각 대한산부인과학회 1999 Obstetrics & Gynecology Science Vol.42 No.5
본 증례에서의 몇 가지 문제점을 살펴보면 과거 수술 반흔을 따라 하복부 횡 절개를 시행하여 수술시야가 확보되지 못 하였고 확장시키기에도 어려움을 겪었다. 이에 따라 태반부착부인 자궁 하절부에 절개를 시행하였으며 태반박리를 시행하여 대량의 급속 출혈이 발생하게 되었다.출혈과 유착으로 인하여 변화된 해부학적 구조하에서 응급 자궁 적출술을 시행하여 방광 표면에 한정된 태반침습에도 불구하고 방광 파열이 발생하였고 발달된 혈관 분포로 인해 출혈이 많이 발생하였으며 이로 인해 수술 시간이 증가되었다. 본 증례를 통해 적절한 산전진단의 방법과 산모 예후를 최적화 시키기위한 처치방법에 대하여 향후 좀 더 많은 연구가 필요하리라고 생각되며 고찰과 함께 보고하는 바이다. Placenta previa percreta is an uncommon and life threatening complication of pregnancy due to massive hemorrhage. And, the direct invasion of placenta to adjacent organ and/or the difficulty of surgery may raise maternal morbidity. To decrease the maternal mortality and morbidity, antepartum diagnosis and proper management is important to prevent catastrophic bleeding and the injury of adjacent organ. We experienced a case of placenta previa percreta at 38weeks of gestational age. Here, we present the case with brief review of literature.
신용각(Yong Kag Shin),박현중(Hyun Joong Park),김형용(Hyung Yong Kim),정찬우(Chan Woo Jeong),고덕영(Duk Young Go),한재희(Jae Hee Han) 대한산부인과학회 1999 Obstetrics & Gynecology Science Vol.42 No.2
Uterine perforation is a serious complication in users of intrauterine devices for contraception. Authors encountered one case of displacement of Copper-T IVD into urinary blpossibly due to uterine perforation on insertion of the Copper-T IUD in a 28 year old 1-multipara, who experienced normal intrauterine pregnancy in the circumstances. This patient was in silent, asymptomatic condition and underwent cesarean section. And Copper-T IUD was removed under the cystotomy. So we report one case with brief review of literatures